Average Participants by Project Type

In a regional science fair, 100 students presented their projects. The data collected showed the types of projects they completed, categorized as follows:

• Biology: 40 students
• Chemistry: 30 students
• Physics: 20 students
• Environmental Science: 10 students

The school decided to analyze the average number of participants per project type based on the data collected. What is the average number of students who participated in each type of project?